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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2632) TeeSinkCodec and FilteringCodec
Date Fri, 03 Sep 2010 10:30:34 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905846#action_12905846
] 

Michael McCandless commented on LUCENE-2632:
--------------------------------------------

This looks very cool Andrzej!

> TeeSinkCodec and FilteringCodec
> -------------------------------
>
>                 Key: LUCENE-2632
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2632
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>    Affects Versions: 4.0
>            Reporter: Andrzej Bialecki 
>         Attachments: LUCENE-2632.patch
>
>
> This issue adds two new Codec implementations:
> * TeeSinkCodec: there have been attempts in the past to implement parallel writing to
multiple indexes so that they are all synchronized. This was however complicated due to the
complexity of IndexWriter/SegmentMerger logic. The solution presented here offers a similar
functionality but working on a different level - as the name suggests, the TeeSinkCodec duplicates
term data into multiple output Directories, and provides a multi-directory abstraction to
perform other operations that are not yet handled by the Codec API (e.g. stored fields handling).
> * FilteringCodec is related in a remote way to the ideas of index pruning presented in
LUCENE-1812 and the concept of tiered search. Since we can use TeeSinkCodec to write to multiple
output Directories in a synchronized way, we could also filter out or modify some of the data
that is being written. The FilteringCodec provides this functionality, so that you can use
like this:
> {code}
> IndexWriter --> TeeSinkCodec
>                  |  |
>                  |  +--> StandardCodec --> Directory1
>                  +--> FilteringCodec --> StandardCodec --> Directory2
> {code}
> The end result of this chain is two indexes that are kept in sync - one is the full regular
index, and the other one is a filtered index.

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